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Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment $ 405   $ 410      
Collectively evaluated for impairment 11,536   10,780      
Total 11,941 $ 11,587 11,190 $ 9,979 $ 9,405 $ 8,886
Real Estate Loans [Member] | Residential [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 30   56      
Collectively evaluated for impairment 1,015   993      
Total 1,045 1,077 1,049 1,104 1,042 1,064
Real Estate Loans [Member] | Commercial [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 159   94      
Collectively evaluated for impairment 3,635   3,773      
Total 3,794 4,006 3,867 3,541 3,665 3,589
Real Estate Loans [Member] | Agricultural [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 25   3      
Collectively evaluated for impairment 3,648   3,140      
Total 3,673 3,340 3,143 2,452 1,952 1,494
Real Estate Loans [Member] | Construction [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 44   23      
Total 44 39 23 45 46 47
Consumer [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 115   124      
Total 115 123 124 125 123 122
Other Commercial Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 151   231      
Collectively evaluated for impairment 1,115   1,041      
Total 1,266 1,273 1,272 1,131 1,215 1,327
Other Agricultural Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 40   26      
Collectively evaluated for impairment 549   466      
Total 589 532 492 431 306 312
State and Political Subdivision Loans [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 767   816      
Total 767 789 816 838 824 833
Unallocated [Member]            
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 648   404      
Total $ 648 $ 408 $ 404 $ 312 $ 232 $ 98